Requirements for the operation of the the Face Detection detector VA and and its sub-tools detectors are given in the table:
| Camera | - FPS is at least 12. For face recognition at turnstiles, FPS is at least 6
- Camera must have lenses that don't produce significant distortion of the face, especially in the centre of the frame
| Note |
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| - Correct operation of the detector has a strong dependence on the optical distortion of the lens. The less distortion in the frame, the higher the accuracy of the algorithms.
- Correct operation of the detector isn't
Correct operation of the detection tool isn't - guaranteed if you use frames that were
masked they into by - by an IP camera or similar methods.
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| Lighting | - Faces must be evenly illuminated with diffused light of at least 200 lux. Directional side lighting isn't allowed
- Contrast of the captured faces must be over 64 grayscale
- Insufficient or excessive lighting isn't allowed
- There must be no backlighting and sharp gradients of light and shade
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| Scene and camera angle | - Maximum angle of frontal perspective of the photos of people’s faces received from cameras must not exceed +/- 15°
- Mutual faces overlapping must be minimal
- We recommend using the centre of the frame for analysis, as this is the area where distortion of the face image is minimized
| Info |
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| You can specify the required distance between the camera and the face using a lens with the required focal length. |
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